Release preparation for version 2.25.0

java/ql/lib/change-notes/released/9.0.0.md

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+## 9.0.0
+
+### Breaking Changes
+
+* The Java control flow graph (CFG) implementation has been completely
+  rewritten. The CFG now includes additional nodes to more accurately represent
+  certain constructs. This also means that any existing code that implicitly
+  relies on very specific details about the CFG may need to be updated.
+  The CFG now only includes the nodes that are reachable from the entry point.
+  Additionally, the following breaking changes have been made:
+  - `ControlFlowNode.asCall` has been removed - use `Call.getControlFlowNode` instead.
+  - `ControlFlowNode.getEnclosingStmt` has been removed.
+  - `ControlFlow::ExprNode` has been removed.
+  - `ControlFlow::StmtNode` has been removed.
+  - `ControlFlow::Node` has been removed - this was merely an alias of
+    `ControlFlowNode`, which is still available.
+  - Previously deprecated predicates on `BasicBlock` have been removed.
+
+### Minor Analysis Improvements
+
+* Inline expectations test comments, which are of the form `// $ tag` or `// $ tag=value`, are now parsed more strictly and will not be recognized if there isn't a space after the `$` symbol.
+* The class `Assignment` now extends `BinaryExpr`. Uses of `BinaryExpr` may in some cases need slight adjustment.